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[How to] Convert Volts to Amps
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me50 Offline

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Post: #1
Convert Volts to Amps
I wanted to know how many amps are in 15 volts so I searched the internet and only found a formula. Things like this are not my strong point. So, I am coming here to see if someone can tell me the answer. One of the sites made me think it might be 3 but I am not sure if this is the correct answer or not.
10-29-2014 11:12 AM
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Crimson Nape Offline

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Post: #2
RE: Convert Volts to Amps
Amperage is basically a ratio of wattage compared to voltage. "Volts" is the level of power being supplied. Wattage is the load or amount of energy needed to make the device operate. To calculate the amperage, you divide the wattage by the volts. As an example; A 1 horsepower motor uses 750 watts at 120 volts. (I know this doesn't relate to a CPAP) Dividing 750/120 = 6.25 amps. Please note: The above descriptions and values have been simplified in order to help with the understanding. I hope this helps.

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10-29-2014 01:30 PM
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me50 Offline

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Post: #3
RE: Convert Volts to Amps
(10-29-2014 01:30 PM)sgearhart Wrote:  Amperage is basically a ratio of wattage compared to voltage. "Volts" is the level of power being supplied. Wattage is the load or amount of energy needed to make the device operate. To calculate the amperage, you divide the wattage by the volts. As an example; A 1 horsepower motor uses 750 watts at 120 volts. (I know this doesn't relate to a CPAP) Dividing 750/120 = 6.25 amps. Please note: The above descriptions and values have been simplified in order to help with the understanding. I hope this helps.

I don't know what the wattage is. All I know is what the volts are and I need to know what the amps are.
10-29-2014 02:17 PM
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retired_guy Offline

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Post: #4
RE: Convert Volts to Amps
I think what brother gearhart is telling us is you can't know what the amps are when you only know the volts. It's like saying "how many teaspoons are in a cupcake?" You need to know how big is the cupcake.
10-29-2014 02:20 PM
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Crimson Nape Offline

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Post: #5
RE: Convert Volts to Amps
It's my fault. I should be asking, "Where are you getting this 15 volt requirement from?" A power supply or a (X)PAP unit?

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10-29-2014 02:43 PM
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justMongo Offline

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Post: #6
RE: Convert Volts to Amps
Wattage is the rate of energy consumption. 1 Watt = 1 Joule/second
Voltage is the electomotive potential. (Think of it like a force)
Amperes is the rate of flow of electrical charge. 1 Ampere = 1 Coulomb/second ( 1 Coulomb = 6.241E18 electrons)

You can have a 12 Volt battery; and open circuit, it flows zero Amperes. Loaded it will flow current (Amperes) depending upon the load.

Two formulas are handy:

Watts = Volts x Amperes (this works for DC, for AC, the cosine between the Voltage and Current must be factored in -- that cosine is called power factor.

And, Volts = Amperes x Resistance (Resistance in measured in Ohms, and is related to the load. -- Again for AC, Reactance must be considered.)

As for the question in the Original Post, it makes no sense it the form the question is cast.

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10-29-2014 03:04 PM
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me50 Offline

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Post: #7
RE: Convert Volts to Amps
I have a power tool that has a 15 volt battery and I want to know how many amps that is
10-29-2014 03:09 PM
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Crimson Nape Offline

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Post: #8
RE: Convert Volts to Amps
The only help I can provide at this point are only 2 things. 1. Look on the battery and see if it lists any number with a mAh or Ah listing. This will be either a milliampere-hour (mAh) or Ampere hour (Ah). If it does have a number , this can give you a ballpark value. The second is to look up the tool's specification on the manufacturer's website and see if they list any power claims. Usually a tool's power is a big selling point used in advertising for manufacturers. Good Luck!

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10-29-2014 03:35 PM
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justMongo Offline

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Post: #9
RE: Convert Volts to Amps
(10-29-2014 03:09 PM)me50 Wrote:  I have a power tool that has a 15 volt battery and I want to know how many amps that is

We are all likely familiar with 1.5 Volt Batteries in various sizes. AAA, AA, C and D. Each is bigger physically. If you short circuit any one of these batteries, they can all provide lots of current flow (Amperes.) The larger size will do so longer.

The 15 Volt Power tool battery can supply Amperes depending on tool load. The measure of battery capacity is usually the only other thing we can talk about. Capacity is measured in Ampere-Hours. Let's say it's a fully charged 30 A-Hr battery. In theory, it can supply 1 Amp for 30 hours; or 2 Amps for 15 hours; or 3 Amps for 10 hours... and so on.

So, while we really cannot talk about Amps for a 15 Volt Battery, we can talk about Ampere-Hours. I bet that battery says what A-Hr capacity it has right on it.

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10-29-2014 04:07 PM
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PaytonA Offline
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Post: #10
RE: Convert Volts to Amps
How many amps that battery puts out depends on the resistance of the tool to the flow of electricity
10-29-2014 04:08 PM
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